#include"apue.h"
#include"apueerror.h"
#include<dirent.h>
int main(int argc,char *argv[])
{
	DIR *dp;
	struct dirent *dirp;
	if(argc !=2){
		err_quit("usage: ls directory_name");
	}
	if((dp = opendir(argv[1])) == NULL ){
		err_sys("can't open %s",argv[1]);
	}
	while((dirp = readdir(dp)) != NULL ){
		printf("%s\n",dirp->d_name);
	}
	closedir(dp);
	exit(0);
}
